YOU SAID:

What comes up must comes down

INTO JAPANESE

何が起こるかは降りなければならない

BACK INTO ENGLISH

What happens has to come down.

INTO JAPANESE

何が起こるかは降りてくる必要があります。

BACK INTO ENGLISH

What happens needs to come down.

INTO JAPANESE

何が起こるかは降りる必要があります。

BACK INTO ENGLISH

What happens needs to get off.

INTO JAPANESE

何が起こるかは降りる必要があります。

BACK INTO ENGLISH

What happens needs to get off.